Editor's note: This story contains graphic content that some readers may find disturbing.

Prosecutors called a criminalist to the stand Friday and worked to tie evidence from three crime scenes to defendant Jason Anthony Warren in an effort to prove they have enough evidence to hold him to stand trial in the deaths of two Humboldt County mothers.

Warren, 29, has pleaded not guilty to two counts of murder and two counts of attempted murder, and faces the death penalty or life in prison without the possibility of parole if convicted on all counts. The charges stem from allegations that Warren tortured and murdered Dorothy Ulrich at her Hoopa home early in the morning of Sept. 27, 2012, before taking a car from her property and -- about 90 minutes later -- intentionally running down three runners on Myrtle Avenue outside of Eureka, killing Suzanne Seemann and seriously injuring Jessica Hunt and Terri Vroman-Little.

Prosecutors called California Department of Justice criminalist Kay Belschner to testify Friday about evidence she analyzed from three separate crime scenes -- Ulrich's home, the scene of the hit-and-run collision on Myrtle Avenue and the silver 2005 Kia Spectra taken from Ulrich's home, which was found damaged and abandoned in Eureka a couple hours after the runners were hit.

Belschner testified that she analyzed the clothing Warren was wearing at the time of his arrest, and found blood stains on the sleeve of his jacket and his shoes, as well as dried blood flakes on his socks, shirt and baseball hat. Earlier in the hearing, a Humboldt County Sheriff's Office detective testified that a subsequent test showed strong evidence that DNA from one of the blood stains on Warren's shoes came from Ulrich.

Under cross-examination by Warren's attorney, Public Defender Kevin Robinson, Belschner said there's no way to determine when the blood may have gotten on Warren's shoes.

Bits of glass found in Warren's shoes and jacket pockets were also tested, Belschner testified, and matched a sample of glass taken from the Kia's shattered windshield. She said she couldn't be sure the glass came from the Kia, saying windshield glass doesn't have a completely unique profile like DNA or fingerprints.

Belschner said she also tested a bloody clump of hair found in the passenger seat of the Kia with a sample taken from Ulrich, and determined they could be a match. Under questioning from Robinson, she said hair analysis is not an exact science and that she couldn't say with any certainty that the hair found in the Kia belonged to Ulrich.

The criminalist said she also found a clump of animal hair from the Kia's front fender, and compared it to a sample taken from Hunt's dog, Maggie, who was killed in the Myrtle Avenue collision. Belschner said the two samples appeared to match.

While being questioned by prosecuting District Attorney Paul Gallegos, Belschner indicated that some items of evidence are still being tested and analyzed.

California Highway Patrol Lt. Harold Rosendahl also testified Friday, telling the court that he arrived at the scene of the Myrtle Avenue collision early in the morning of Sept. 27, 2012, to find a woman lying on her back in the southbound lane, screaming. He said he quickly noticed another victim lying on the road's grass shoulder.

”There was screaming going on everywhere,” he testified.

Rosendahl testified that he later compared a small piece of a vehicle's grill or molding found at the Myrtle Avenue scene with the damaged Kia.

”There's no doubt in my mind it belonged to that vehicle,” he said, adding that he also compared a piece of a side mirror found at the collision site with the Kia, and also determined they matched.

Ariel Gruenthal, an HSU anthropology lecturer who was a deputy Humboldt County coroner at the time of Seemann and Ulrich's deaths, also testified Friday, telling the court that she was called to both crime scenes.

She testified that Seemann had a number of visible injuries, including a pair of lacerations on the back of one of her legs and some bruising to her eyes. An autopsy determined she died of multiple skull fractures, brain injury and internal cranial hemorrhaging. 

Gruenthal testified that an autopsy performed on Ulrich determined she died of “multiple sharp and blunt force injuries.”

CHP Officer Charles Steen testified Friday that he was called to Myrtle Avenue the morning of Sept. 27, 2012, to chart the collision scene.

”How many victims did you observe?” Gallegos asked.

”I, personally, feel like I observed four: The three women and the dog, Maggie,” Steen said.

The hearing is expected to continue Monday morning, though it's unclear if Gallegos will call additional witnesses. He told the court on Friday that two witnesses he subpoenaed to testify hadn't shown up, but said it is “extremely likely” that he wouldn't call any further witnesses to testify.

Thadeus Greenson can be reached at 441-0509 or tgreenson@times-standard.com. Follow him on Twitter @ThadeusGreenson.